Added links to bash guide

bash.md

@@ -26,6 +26,15 @@ https://www.shellcheck.net/
 - https://medium.com/wemake-services/testing-bash-applications-85512e7fe2de
 - https://likegeeks.com/bash-scripting-step-step-part2/
 - https://dev.to/thiht/shell-scripts-matter
+- http://redsymbol.net/articles/unofficial-bash-strict-mode/
+- http://redsymbol.net/articles/bash-exit-traps/
+- http://unix.stackexchange.com/questions/97101/how-to-catch-an-error-in-a-linux-bash-script
+- https://www.gnu.org/software/bash/manual/html_node/Command-Grouping.html
+- https://www.vidarholen.net/contents/blog/?p=178
+- http://www.linuxjournal.com/content/bash-sub-shells
+- https://stelfox.net/blog/2013/11/fail-fast-in-bash-scripts/
+- http://rockhopper.monmouth.edu/cs/jchung/cs370/cs_370_-_subshells_and_parallel_processing
+- https://jvns.ca/blog/2017/03/26/bash-quirks/
 
 ## Windows
 **Windows cmd.exe access BASH WSL**